/// <summary>
/// Position "nav" to the matching node which follows it in document order but is not a descendant node.
/// Return false if this is no such matching node.
/// </summary>
internal static bool MoveFirst(XmlNavigatorFilter filter, XPathNavigator nav) {
// Attributes and namespace nodes include descendants of their owner element in the set of following nodes
if (nav.NodeType == XPathNodeType.Attribute || nav.NodeType == XPathNodeType.Namespace) {
if (!nav.MoveToParent()) {
// Floating attribute or namespace node that has no following nodes
return false;
}
if (!filter.MoveToFollowing(nav, null)) {
// No matching following nodes
return false;
}
}
else {
// XPath spec doesn't include descendants of the input node in the following axis
if (!nav.MoveToNonDescendant())
// No following nodes
return false;
// If the sibling does not match the node-test, find the next following node that does
if (filter.IsFiltered(nav)) {
if (!filter.MoveToFollowing(nav, null)) {
// No matching following nodes
return false;
}
}
}
// Success
return true;
}
public virtual bool MoveToFollowing(XPathNodeType type, XPathNavigator end)
{
XPathNavigator other = this.Clone();
int contentKindMask = GetContentKindMask(type);
if (end != null)
{
switch (end.NodeType)
{
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
end = end.Clone();
end.MoveToNonDescendant();
break;
}
}
switch (this.NodeType)
{
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
if (this.MoveToParent())
{
break;
}
return false;
}
Label_005C:
if (!this.MoveToFirstChild())
{
do
{
if (this.MoveToNext())
{
goto Label_007E;
}
}
while (this.MoveToParent());
this.MoveTo(other);
return false;
}
Label_007E:
if ((end != null) && this.IsSamePosition(end))
{
this.MoveTo(other);
return false;
}
if (((((int) 1) << this.NodeType) & contentKindMask) == 0)
{
goto Label_005C;
}
return true;
}
public virtual bool MoveToFollowing(XPathNodeType type, XPathNavigator end)
{
XPathNavigator navSave = Clone();
int mask = XPathNavigatorEx.GetContentKindMask(type);
if (end != null)
{
switch (end.NodeType)
{
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
// Scan until we come to the next content-typed node
// after the attribute or namespace node
end = end.Clone();
end.MoveToNonDescendant();
break;
}
}
switch (NodeType)
{
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
if (!MoveToParent())
{
return false;
}
break;
}
do
{
if (!MoveToFirstChild())
{
// Look for next sibling
while (true)
{
if (MoveToNext())
break;
if (!MoveToParent())
{
// Restore previous position and return false
MoveTo(navSave);
return false;
}
}
}
// Have we reached the end of the scan?
if (end != null && IsSamePosition(end))
{
// Restore previous position and return false
MoveTo(navSave);
return false;
}
}
while (((1 << (int)NodeType) & mask) == 0);
return true;
}
public virtual bool MoveToFollowing(string localName, string namespaceURI, XPathNavigator end)
{
XPathNavigator other = this.Clone();
if (end != null)
{
switch (end.NodeType)
{
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
end = end.Clone();
end.MoveToNonDescendant();
break;
}
}
switch (this.NodeType)
{
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
if (this.MoveToParent())
{
break;
}
return false;
}
Label_0055:
if (!this.MoveToFirstChild())
{
do
{
if (this.MoveToNext())
{
goto Label_0077;
}
}
while (this.MoveToParent());
this.MoveTo(other);
return false;
}
Label_0077:
if ((end != null) && this.IsSamePosition(end))
{
this.MoveTo(other);
return false;
}
if (((this.NodeType != XPathNodeType.Element) || (localName != this.LocalName)) || (namespaceURI != this.NamespaceURI))
{
goto Label_0055;
}
return true;
}
public virtual bool MoveToFollowing(string localName, string namespaceURI, XPathNavigator end)
{
XPathNavigator navSave = Clone();
if (end != null)
{
switch (end.NodeType)
{
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
// Scan until we come to the next content-typed node
// after the attribute or namespace node
end = end.Clone();
end.MoveToNonDescendant();
break;
}
}
switch (NodeType)
{
case XPathNodeType.Attribute:
case XPathNodeType.Namespace:
if (!MoveToParent())
{
return false;
}
break;
}
do
{
if (!MoveToFirstChild())
{
// Look for next sibling
while (true)
{
if (MoveToNext())
break;
if (!MoveToParent())
{
// Restore previous position and return false
MoveTo(navSave);
return false;
}
}
}
// Have we reached the end of the scan?
if (end != null && IsSamePosition(end))
{
// Restore previous position and return false
MoveTo(navSave);
return false;
}
}
while (NodeType != XPathNodeType.Element
|| localName != LocalName
|| namespaceURI != NamespaceURI);
return true;
}